INGREDIENTS
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2 tablespoons olive oil
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1 medium onion, chopped
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2 medium leeks, white and pale-green parts only, chopped
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2 celery stalks, chopped
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4 garlic cloves, chopped
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Kosher salt and freshly ground black pepper
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2 Yukon Gold potatoes, unpeeled, cut into small pieces
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1 cup chopped leftover ham
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1 ham bone
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6 sprigs thyme
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2 bay leaves
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2 cups green split peas
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2 tablespoons Worcestershire sauce
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Sour cream and croutons (for serving; optional)